//For reference:
//(byte)(-128)==(byte)0x80
//(byte)(127)==(byte)0x7F
//TODO: implement AL.LastUsedRegister for determining if a CMP is still needed before a branch operation
public void While(Func <Condition> condition)
{
//An outer context to account for conditions that output some code
Context.Write(_labels.ContinueLabel);
Context.New(() => {
_block?.Invoke(_labels);
var c = condition.Invoke();
var len = -Context.Length - 2; //-2 is to account for the branch instruction
if (len >= LOWEST_BRANCH_VAL)
{
Branch(c, len);
}
else
{
Branch(c, CPU6502.Asm.OC["JMP"][CPU6502.Asm.Mode.Absolute].Length, true);
CPU6502.JMP(Context.StartLabel);
}
});
Context.Write(_labels.BreakLabel);
}